ˈdär‧ˌtrōs also -ōz
plural -s
: a disease of the potato and tomato caused by a fungus (Colletotrichum atramentarium) and characterized by destruction of the stems especially towards the base, by yellowing and drying of the foliage, and by development of numerous small black sclerotia in the diseased stem tissue

called also black dot, black speck

Word History


French, from dartre herpes, tetter (from Middle French dertre, from Latin derbita, of Celtic origin; akin to Middle Breton dervoeden herpes, Welsh darwden, tarwden ringworm) + -ose; akin to Old English teter tetter, Old High German zittaroh herpes, tetter, Sanskrit dadru, a kind of leprosy, skin eruption, Old English teran to tear

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Dictionary Entries Near dartrose

Cite this Entry

“Dartrose.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/dartrose. Accessed 29 May. 2023.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!